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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68702e1f6970959de9288b11a6216ee5eae4992d3809a9dd88d10352cec77cde' 
  AND token = 'L24PnqDHKFlJaVy/d0UEqhlqlDHRDZwhv+XxsEKxmVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}